Concrete is a solid block which comes in the 16 regular dye colors. Concrete is formed when concrete powder comes into contact with a block of water. It is not formed by contact with rain, cauldrons, particles, or similar. Concrete's bright and solid colors makes it useful for decoration. It has more pronounced colors than stained hardened clay, and is not flammable like wool. As a building material, its hardness is slightly higher than stone, but its blast resistance is significantly lower.